Palladium-carbene catalyzed direct arylation of five-membered heteroaromatics


KALOĞLU M. , Kaloglu N., Ylidirim I., ÖZDEMİR N., ÖZDEMİR İ.

JOURNAL OF MOLECULAR STRUCTURE, cilt.1206, 2020 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

Due to the industrial importance of bi(hetero)arenes, the synthesis of these compounds by homogeneous Pd-catalyzed direct arylation is an important research topic in modern organic chemistry. In this study, PEPPSI-type, (PEPPSI = Pyridine Enhanced Precatalyst Preparation Stabilization and Initiation), new Pd-catalysts with N-heterocyclic carbene ligand were synthesized, and they were used as catalysts in the synthesis of bi(hetero)arenes by direct arylation process. The structures of Pd-carbene complexes were elucidated by different spectroscopic and analytical techniques such as NMR, FT-IR and elemental analysis. The more detailed structural characterization of one of the complexes was determined by single-crystal X-ray diffraction study. Pd-carbene complexes were used as effective catalysts in the direct arylation of five-membered heteroaromatics such as thiophene, furan and thiazole derivatives with (hetero)aryl bromides for 1 h, in the presence of 1 mol% of catalyst loading, and successful results were obtained. (C) 2020 Elsevier B.V. All rights reserved.